[
https://issues.apache.org/jira/browse/HADOOP-18024?focusedWorklogId=686298&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-686298
]
ASF GitHub Bot logged work on HADOOP-18024:
-------------------------------------------
Author: ASF GitHub Bot
Created on: 25/Nov/21 09:03
Start Date: 25/Nov/21 09:03
Worklog Time Spent: 10m
Work Description: hadoop-yetus commented on pull request #3719:
URL: https://github.com/apache/hadoop/pull/3719#issuecomment-978983225
:broken_heart: **-1 overall**
| Vote | Subsystem | Runtime | Logfile | Comment |
|:----:|----------:|--------:|:--------:|:-------:|
| +0 :ok: | reexec | 1m 1s | | Docker mode activated. |
|||| _ Prechecks _ |
| +1 :green_heart: | dupname | 0m 0s | | No case conflicting files
found. |
| +0 :ok: | codespell | 0m 0s | | codespell was not available. |
| +1 :green_heart: | @author | 0m 0s | | The patch does not contain
any @author tags. |
| -1 :x: | test4tests | 0m 0s | | The patch doesn't appear to include
any new or modified tests. Please justify why no new tests are needed for this
patch. Also please list what manual steps were performed to verify this patch.
|
|||| _ trunk Compile Tests _ |
| +1 :green_heart: | mvninstall | 33m 21s | | trunk passed |
| +1 :green_heart: | compile | 22m 47s | | trunk passed with JDK
Ubuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04 |
| +1 :green_heart: | compile | 19m 46s | | trunk passed with JDK
Private Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10 |
| +1 :green_heart: | checkstyle | 1m 8s | | trunk passed |
| +1 :green_heart: | mvnsite | 1m 41s | | trunk passed |
| +1 :green_heart: | javadoc | 1m 10s | | trunk passed with JDK
Ubuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04 |
| +1 :green_heart: | javadoc | 1m 47s | | trunk passed with JDK
Private Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10 |
| +1 :green_heart: | spotbugs | 2m 37s | | trunk passed |
| +1 :green_heart: | shadedclient | 22m 18s | | branch has no errors
when building and testing our client artifacts. |
|||| _ Patch Compile Tests _ |
| +1 :green_heart: | mvninstall | 0m 59s | | the patch passed |
| +1 :green_heart: | compile | 21m 56s | | the patch passed with JDK
Ubuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04 |
| +1 :green_heart: | javac | 21m 56s | | the patch passed |
| +1 :green_heart: | compile | 19m 25s | | the patch passed with JDK
Private Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10 |
| +1 :green_heart: | javac | 19m 25s | | the patch passed |
| +1 :green_heart: | blanks | 0m 0s | | The patch has no blanks
issues. |
| +1 :green_heart: | checkstyle | 1m 8s | | the patch passed |
| +1 :green_heart: | mvnsite | 1m 38s | | the patch passed |
| +1 :green_heart: | javadoc | 1m 7s | | the patch passed with JDK
Ubuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04 |
| +1 :green_heart: | javadoc | 1m 39s | | the patch passed with JDK
Private Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10 |
| +1 :green_heart: | spotbugs | 2m 45s | | the patch passed |
| +1 :green_heart: | shadedclient | 22m 37s | | patch has no errors
when building and testing our client artifacts. |
|||| _ Other Tests _ |
| +1 :green_heart: | unit | 17m 43s | | hadoop-common in the patch
passed. |
| +1 :green_heart: | asflicense | 0m 54s | | The patch does not
generate ASF License warnings. |
| | | 199m 19s | | |
| Subsystem | Report/Notes |
|----------:|:-------------|
| Docker | ClientAPI=1.41 ServerAPI=1.41 base:
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3719/1/artifact/out/Dockerfile
|
| GITHUB PR | https://github.com/apache/hadoop/pull/3719 |
| Optional Tests | dupname asflicense compile javac javadoc mvninstall
mvnsite unit shadedclient spotbugs checkstyle codespell |
| uname | Linux e25179bc9802 4.15.0-112-generic #113-Ubuntu SMP Thu Jul 9
23:41:39 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | dev-support/bin/hadoop.sh |
| git revision | trunk / b0f8903268f6d234e15ec004fc7c3661aba2a816 |
| Default Java | Private Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10 |
| Multi-JDK versions |
/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04
/usr/lib/jvm/java-8-openjdk-amd64:Private
Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10 |
| Test Results |
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3719/1/testReport/ |
| Max. process+thread count | 1281 (vs. ulimit of 5500) |
| modules | C: hadoop-common-project/hadoop-common U:
hadoop-common-project/hadoop-common |
| Console output |
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3719/1/console |
| versions | git=2.25.1 maven=3.6.3 spotbugs=4.2.2 |
| Powered by | Apache Yetus 0.14.0-SNAPSHOT https://yetus.apache.org |
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Issue Time Tracking
-------------------
Worklog Id: (was: 686298)
Time Spent: 40m (was: 0.5h)
> SocketChannel is not closed when IOException happens in
> Server$Listener.doAccept
> --------------------------------------------------------------------------------
>
> Key: HADOOP-18024
> URL: https://issues.apache.org/jira/browse/HADOOP-18024
> Project: Hadoop Common
> Issue Type: Bug
> Components: ipc
> Affects Versions: 3.2.2
> Reporter: Haoze Wu
> Priority: Major
> Labels: pull-request-available
> Time Spent: 40m
> Remaining Estimate: 0h
>
> This is a follow-up of HADOOP-17552.
> When the symptom described in HADOOP-17552 happens, the client may time out
> in 2min, according to the default RPC timeout configuration specified in
> HADOOP-17552. Before this timeout, the client just waits, and does not know
> this issue happens.
> However, we recently found that actually the client doesn’t need to waste
> this 2min, and the server’s availability can be also improved. If the
> IOException happens in line 1402 or 1403 or 1404, we can just close this
> problematic `SocketChannel` and continue to accept new socket connections.
> The client side can also be aware of the close socket immediately, instead of
> waiting 2min.
> The old implementation:
> {code:java}
> //hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/Server.java
> public void run() {
> while (running) {
> // ...
> try {
> // ...
> while (iter.hasNext()) {
> // ...
> try {
> if (key.isValid()) {
> if (key.isAcceptable())
> doAccept(key); // line 1348
> }
> } catch (IOException e) { // line 1350
> }
> // ...
> }
> } catch (OutOfMemoryError e) {
> // ...
> } catch (Exception e) {
> // ...
> }
> }
> } {code}
> {code:java}
> //hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/Server.java
> void doAccept(SelectionKey key) throws InterruptedException, IOException,
> OutOfMemoryError {
> ServerSocketChannel server = (ServerSocketChannel) key.channel();
> SocketChannel channel;
> while ((channel = server.accept()) != null) { // line 1400
> channel.configureBlocking(false); // line 1402
> channel.socket().setTcpNoDelay(tcpNoDelay); // line 1403
> channel.socket().setKeepAlive(true); // line 1404
> Reader reader = getReader();
> Connection c = connectionManager.register(channel,
> this.listenPort, this.isOnAuxiliaryPort);
> // If the connectionManager can't take it, close the connection.
> if (c == null) {
> if (channel.isOpen()) {
> IOUtils.cleanup(null, channel);
> }
> connectionManager.droppedConnections.getAndIncrement();
> continue;
> }
> key.attach(c); // so closeCurrentConnection can get the object
> reader.addConnection(c);
> }
> } {code}
>
> We propose that the following implementation is better:
> {code:java}
> void doAccept(SelectionKey key) throws InterruptedException, IOException,
> OutOfMemoryError {
> ServerSocketChannel server = (ServerSocketChannel) key.channel();
> SocketChannel channel;
> while ((channel = server.accept()) != null) { // line 1400
> try {
> channel.configureBlocking(false); // line 1402
> channel.socket().setTcpNoDelay(tcpNoDelay); // line 1403
> channel.socket().setKeepAlive(true); // line 1404
> } catch (IOException e) {
> LOG.warn(...);
> try {
> channel.socket().close();
> channel.close();
> } catch (IOException ignored) { }
> continue;
> }
> // ...
> }
> }{code}
> The advantages include:
> # {*}In the old implementation{*}, the `ServerSocketChannel` was abandoned
> due to the single exception in this single `SocketChannel`, because the
> exception handler is in line 1350. {*}In the new implementation{*}, we use a
> try-catch to handle the exception in line 1402 or 1403 or 1404, then the
> `ServerSocketChannel` can continue to accept new connections, and don’t need
> to go back to the line 1348 in the next while loop in the run method.
> # {*}In the old implementation{*}, the client (another endpoint of this
> `SocketChannel`) is not aware of this issue, because the `SocketChannel` is
> accepted and not closed. {*}In the new implementation{*}, we close the
> `SocketChannel` when the IOException happens, then the client will
> immediately get EOF from the socket. Then the client can choose to retry or
> throw an exception, by the client’s discretion.
>
> We have confirmed that this patch works as expected, in our local machine.
>
> This code pattern was adopted by other communities. For example, in Kafka
> [https://github.com/apache/kafka/blob/23e9818e625976c22fe6d4297a5ab76b01f92ef6/core/src/main/scala/kafka/network/SocketServer.scala#L714-L740]:
> {code:java}
> /**
> * Accept a new connection
> */
> private def accept(key: SelectionKey): Option[SocketChannel] = {
> val serverSocketChannel = key.channel().asInstanceOf[ServerSocketChannel]
> val socketChannel = serverSocketChannel.accept()
> try {
> connectionQuotas.inc(endPoint.listenerName,
> socketChannel.socket.getInetAddress, blockedPercentMeter)
> configureAcceptedSocketChannel(socketChannel)
> Some(socketChannel)
> } catch {
> case e: TooManyConnectionsException =>
> info(...)
> close(endPoint.listenerName, socketChannel)
> None
> case e: ConnectionThrottledException =>
> // ...
> None
> case e: IOException =>
> error(...)
> close(endPoint.listenerName, socketChannel)
> None
> }
> }
> /**
> * Close `channel` and decrement the connection count.
> */
> def close(listenerName: ListenerName, channel: SocketChannel): Unit = {
> if (channel != null) {
> // ...
> closeSocket(channel)
> }
> }
> protected def closeSocket(channel: SocketChannel): Unit = {
> CoreUtils.swallow(channel.socket().close(), this, Level.ERROR)
> CoreUtils.swallow(channel.close(), this, Level.ERROR)
> }
> {code}
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